电力系统及其自动化学报2017，Vol.29Issue(9)：86-92,7.DOI:10.3969/j.issn.1003-8930.2017.09.015
电力系统电压稳定鞍结分岔点的快速求取方法
Fast Calculation Method for Saddle Node Bifurcation Point of Voltage Stability of Power System
摘要
Abstract
In order to fast calculate the saddle node bifurcation point of voltage stability of power system,a combination method with automatic variable step is proposed based on continuation power flow method and local curve fitting meth?od. By using generalized Thevenin dynamic equivalence theory,the essential conditions for reaching the extreme values of transmission power in a nonlinear power network are proved. Moreover,impedance modulus margin index is defined to determine the weakest node of static voltage stability of the system. An increasing step length is obtained according to the power flow state at the next operation point predicted by the impedance modulus at the current operation point ,thus an automatic variable step is realized,and the saddle node bifurcation point is approached fast but not crossed over. When the impedance modulus margin satisfies the value required by local curve fitting,i.e.,impedance modulus mar?gin criterion,the saddle node bifurcation point will be accurately fitted and a more accurate value will be obtained. Simulations of several IEEE test systems show that the proposed method is simple,accurate,fast and with less computa?tional load,thus it can be applied to large-scale power networks.关键词
电力系统/电压稳定/鞍结分岔/广义戴维南等值/阻抗模裕度判据/局部曲线拟合Key words
power system/voltage stability/saddle node bifurcation/generalized Thevenin equivalence/impedance modulus margin criterion/local curve fitting分类
信息技术与安全科学引用本文复制引用
朱永强,刘光晔,曹斌,匡一雷,康志豪,刘媛媛..电力系统电压稳定鞍结分岔点的快速求取方法[J].电力系统及其自动化学报,2017,29(9):86-92,7.基金项目
国家自然科学基金资助项目(51577053) （51577053）
